Journal
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
Volume 68, Issue 12, Pages 5018-5028Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSI.2021.3113180
Keywords
Receiver architecture; low IF receiver; complex hand pass filter; trans-impedance amplifier (TIA); fully differential trans-impedance operational amplifier (OTA); class AB output-stage; common mode feed-hack loop (CMFB); start-up circuit
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This paper presents a low-power, high-performance 2nd-order complex band-pass filter with high gain and bandwidth, implemented in CMOS technology.
In this paper a low-power and high-performance 2nd-order complex band-pass filter in trans-impedance amplifier (TIA) configuration is presented. Thanks to the adopted topology for the passive network and active-components exceeds current solutions exhibiting a gain as high as 121.5 dB(Omega) and 1.57 MHz of bandwidth centered around 133 MHz. The output noise is only 630 nV/root Hz. Furthermore, a new fully-differential class-AB operational trans-conductance amplifier (OTA) provides the required current to drive heavy ADC loads with very fast signals while an improved common-mode feedback circuit enables ultra low current without introducing stability and avoids start-up problems. The filter has been integrated in a 90-nm complementary metal oxide semiconductor (CMOS) technology. Despite the high performance and accuracy of the transfer function the power consumption is only 400 mu A from a 1.2-V power supply.
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